Secondary member of induction-motors.



APPLIUATION FILED 0GT.31, 1910.

Patented July 29, 1913.

WITNESSES:

srArEs PATENT cmcc,

' enononn. sandman, or WILKINSBITRG, PENNSYLVANIA, ASSIGNOR r WESTING- Inous]; ELECTRIC AINI) sYLvANIA.

To all whom it may concern.

Be it known that I, Gnonen HOLLAND- GcRoELoN, a citizen of theUnited-States,

-and a resident of Wi-lkinsburg, in the county of Allegheny and State ofPennsylvania, have/"invented a new and useful Improvement in SecondaryMembers of Inductiom Motors, of which the following is a specification.v

My invention relates. to the secondary members of induction motors andparticularly to the secondary members of motors of the squirrel-cagetype. Q

The object of my invention is to provide a secondary member of thesquirrel cage type in which strap conductors may employed and in whichthe core' slots may be skewed or inclined to the axis of the mem--'Howeven'when strap conductors have been employed in thepast, it hasbeen necessary to twist or bend the conductors, but, in the presentinstance, the' parts of the members are so constructed and arranged thatthe skewing of the slots may be effected without twisting or bending thestrap conductors.

Figure 1 of the accompanying drawing is a perspective and sectional'viewof a part of the secondary member of an induction motor that isconstructed in accordance with the present invention. Fig. 1 is asectional perspective view indicated byline X-X of Fig. 1. Fig. 2 is afront face view of a portion of one of the end plates of the member, andFig. 3 is a corresponding view of a portion of one of the core punohingsof the member. 4

The member comprises two conducting, but preferably non-magnetizable,end plates 1 and intermediate magnetizable core punchings or plates 2,the said parts being provided with slots adjacent to their peripheries.

for the reception of strap' or bar conductors 3 of substantiall The endsof the g v Specification of Letters Patent. Application filed o'ctcbcra1, 1910. Serial No. 589,915.

rectangular cross section. ars 3 project somewhat be 1 machinescomprising end plates provided 110 SECONDARY MEMBERor'iNnUcrIoN-Moroits.

Patented July-29, 191

yond the endp-lates 1 and are slitted longitu- MANUFACTURING COMPANY, ACORPORATION OF PENN- di-nally, the .portions -thereof adjacent to. the

slots being bent over upon the end plates to clamp the core .partstogether and to provide I good electrical connections between the barsand the end plates. This electrical'connec'- tion may also be improvedbysoldering.

' The sides of the teeth that intervene beare preferably parallel tomedian radial tween the peripheral slots in the .core plates linesextending through the teeth and, consequently, the enter portions er theslots are wider than their inner pent/ions, their widths at their innerportions being approximately equal to the thickness of the conductingbars. The bars 3 will thus not-entirely the outer portions of the slotsbut may lie against the one side or the other thereof. a The slots inthe end plates are only slightly .larger than theconducting liars, inorder that the said parts may fit together rather closely and goodelectrical connections be made between them, andal'so in order thatthecore parts may be securely clamped together by the bending over ofthe ends of the bars. Of course, the coreslots may be of other shapes,if. desired, providing the conductors do not entirely fill their outerportions. The. end plate slots preferably have parallel sides, and oneside of each slot lies adjacent to,-and in substantialalinement with,one side of a corresponding slot in the core plates. The sides of theend platev slots are, accordingly, inclined with respect to radiipassing through them, and in such manner that the conducting bars andcore slots may be inclined or skewed with respect to the axis of themember without bending or twisting the bars, the inclination of theslots in one end plate being the reverse of that in the other. The coreslots are skewedto such a degree that each bar lies fiat against oneside of its slot at one end of the core'and against the other side ofthe slot at the other end of the core.

I claim as my invention:

1. A core member for dynamo electric machines comprising magnetizablecore plates provided with slots the sides of which are parallel to theradii that bisect adjacent teeth and end plates provided withslots thesides, of which are inclined to the radii passing therethrough.'

2. A coremember for dynamoelectric plates-provided with slots largerthan those in the end plates.

3. A core member for dynamo-- electric machines comprlsin'g end platesprovided with slots having sides inclined to the radii passingtherethrou'gh, the sides of the slots 'in one end plate being inclinedreversely to I 'bination with a member comprising core the sides of theslots in the other plate.

AHA core member for dynamoelectric machines comprising end platesprovided with slots having sides inclined to the radii passingtherethrough intermediate plates provided with slots larger than thosein the end plates, and conductors located in the said slots and inclinedto the axisof the core member.

5 In a dynamo-electric machine, the combination with a member comprisingcore plates having radial slots and end plates having non-radial slots,of conductors located in the said slots, the slots in the end platescloselyfitting the conductors while those inthe core plates are-1naterially larger than the conductors.

6; In'a dynamo-electric machine, the combination with a membercomprisingcore plates and end plates having peripheral slots, inclined withrespect to the axis of the member, of conductors located in the saidslots, the slots in the end plates closely fitting'the conductors vwhilethose in the core plates are materially larger than the conductOI'Sc.

7 In a dynamo-electric machine, the complates and end plates havingperipheral slots inclined 'with respect to the axis of the member, of-fiatconductors located in the said slots, the slots in the end platesclosely fitting the conductors while those in the core plates arematerially larger than the conductors, and the conductors lying againstone side of the slots in the core plates at one end of the member andagainst the other side thereof at the other end of the member,

In testimony whereof, I have hereunto subscribed my name this 27th dayof October 1910.

GEO. H. GARCELON. \Nitnesses J OHN N. NoRDsTRoM,

B. B; HINES.

